P0175 on the 2023 Hyundai Palisade
The 2023 Hyundai Palisade continues with the Lambda II 3.8L GDI V6 producing 291 hp, paired with an 8-speed automatic transmission. This full-size three-row SUV uses gasoline direct injection, which makes carbon buildup a relevant diagnostic consideration. Bank 2 on the V6 is the rear cylinder bank. P0175 means the ECM has detected persistent over-fueling on this bank.
Symptoms
- Check engine light illuminated
- Fuel economy dropping from the rated 19-26 MPG
- Rough idle or vibration at stop lights
- Black exhaust deposits
- Reduced power during highway merging or passing
- Fuel odor near the tailpipe
Common Causes
1. MAF Sensor Contamination (High Likelihood)
At 15,000-40,000 miles typical for 2023 models, the MAF sensor may have accumulated enough PCV oil vapor to affect readings. The Lambda II V6 has a high-volume air intake, and the MAF sensor's hot-wire element is sensitive to contamination. This is the cheapest, easiest cause to check and fix. A $10 can of MAF cleaner often resolves the code.
2. Early GDI Carbon Buildup (Medium Likelihood)
The 3.8L GDI engine is known for carbon accumulation on intake valves. While 15,000-40,000 miles is early for severe buildup, drivers who primarily use the Palisade for short city trips accelerate the process. Carbon deposits begin forming from the first miles and gradually affect airflow and combustion. Using top-tier fuel helps slow accumulation but doesn't prevent it entirely.
3. Upstream O2 Sensor Issue (Medium Likelihood)
A manufacturing defect or early degradation in the Bank 2 upstream O2 sensor can cause incorrect fuel trim feedback. While uncommon at this age, it is possible. The rear bank sensor position on the Palisade receives less cooling airflow from the front of the vehicle, which can contribute to faster sensor aging. Test with a scan tool for response time.
4. Fuel Injector Concern (Low Likelihood)
GDI injector issues at low mileage are rare but possible due to manufacturing defects. A slightly leaking injector on the rear bank would add unmetered fuel to one or more cylinders. This would be a warranty-covered defect. The dealer can perform injector balance testing to identify any problematic injectors.
Family Vehicle Considerations
The Palisade is primarily used as a family hauler, which means lots of short trips (school, errands, activities). This driving pattern is the worst for GDI carbon accumulation because the engine doesn't reach and maintain high enough temperatures to naturally burn off deposits. Plan occasional longer highway drives to help the engine reach full operating temperature and reduce carbon buildup.
Diagnostic Steps
- Scan all codes. Check for P0172 (Bank 1 rich) to determine scope.
- Monitor Bank 2 fuel trim data.
- Clean the MAF sensor and clear codes.
- Test Bank 2 O2 sensor response time.
- If within warranty, take to dealer for comprehensive diagnosis.
Warranty and Costs
The 2023 Palisade is under Hyundai's 5-year/60,000-mile basic and 10-year/100,000-mile powertrain warranty. All P0175 causes should be covered at a dealer. Out-of-warranty: MAF cleaning $10-$15, MAF replacement $130-$290, O2 sensor $170-$350, carbon cleaning $500-$800.